WO2011075399A1 - Advanced catalysts for automotive applications - Google Patents
Advanced catalysts for automotive applications Download PDFInfo
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- WO2011075399A1 WO2011075399A1 PCT/US2010/059760 US2010059760W WO2011075399A1 WO 2011075399 A1 WO2011075399 A1 WO 2011075399A1 US 2010059760 W US2010059760 W US 2010059760W WO 2011075399 A1 WO2011075399 A1 WO 2011075399A1
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- active material
- monolith
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- particles
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- 239000003054 catalyst Substances 0.000 title claims abstract description 68
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000011149 active material Substances 0.000 claims abstract description 87
- 239000002105 nanoparticle Substances 0.000 claims abstract description 75
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 72
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 43
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 26
- 239000010948 rhodium Substances 0.000 claims abstract description 26
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 26
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 72
- 230000003197 catalytic effect Effects 0.000 claims description 40
- 239000006185 dispersion Substances 0.000 claims description 36
- 238000005516 engineering process Methods 0.000 claims description 32
- 238000009833 condensation Methods 0.000 claims description 29
- 230000005494 condensation Effects 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 29
- 238000001354 calcination Methods 0.000 claims description 25
- 238000001035 drying Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 229910052878 cordierite Inorganic materials 0.000 claims description 16
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000012876 carrier material Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- -1 platinum ions Chemical class 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 239000011859 microparticle Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 229910000629 Rh alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- XSKIUFGOTYHDLC-UHFFFAOYSA-N palladium rhodium Chemical compound [Rh].[Pd] XSKIUFGOTYHDLC-UHFFFAOYSA-N 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/8926—Copper and noble metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/46—Ruthenium, rhodium, osmium or iridium
- B01J23/464—Rhodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/20—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state
- B01J35/23—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state in a colloidal state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/009—Preparation by separation, e.g. by filtration, decantation, screening
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0211—Impregnation using a colloidal suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/32—Freeze drying, i.e. lyophilisation
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/349—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of flames, plasmas or lasers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0081—Embedding aggregates to obtain particular properties
- B28B23/0087—Lightweight aggregates for making lightweight articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- a catalytic converter for a car uses a catalyst to convert, for example, three harmful compounds in car exhaust into less harmful compounds.
- the three harmful compounds include hydrocarbons in the form of unburned gasoline, carbon monoxide formed by the combustion of gasoline, and nitrogen oxide created when heat in the engine forces nitrogen in the air to combine with oxygen.
- honeycomb and ceramic beads Most automobiles today use the honeycomb structure.
- the honeycomb structure is housed in a muffler-like package that comes before the exhaust pipe.
- the catalyst helps to convert carbon monoxide into carbon dioxide, the hydrocarbons into carbon dioxide and water, and the nitrogen oxides back into nitrogen and oxygen.
- FIG. 1 A illustrates a first conventional method of manufacturing the catalyst.
- the first method is known as a one-dip process.
- micron-sized platinum (Pt) ions are impregnated into micron-sized alumina (A1 2 0 3 ) ions, resulting in micro-particles.
- the micro-particles have platinum atoms on the alumina ions.
- a wash coat is made using micron-sized oxides that include pint size alumina and pint size silica (Si0 2 ), a certain amount of stabilizers for the alumina, and a certain amount of promoters.
- the micro-particles are mixed together with the wash coat.
- a cylindrical-shaped ceramic monolith is obtained.
- a cross-section of the monolith contains 300-600 channels per square inch.
- the channels are linear square channels that run from the front to the back of the monolith.
- the monolith is coated with the wash coat. This can be achieved by dipping the monolith in the wash coat. As such, the channels of the monolith are coated with a layer of wash coat.
- the monolith is dried.
- the layer of wash coat has an irregular surface, which has a far greater surface area than a flat surface.
- the wash coat when dried is a porous structure.
- the irregular surface and the porous structure are desirable because they give a high surface area, approximately 100-250 m 2 /g, and thus more places for the micro-particles to bond thereto.
- the monolith dries, the micro-particles settle on the surface and pores of the monolith.
- the monolith is calcined. The calcination bonds the components of the wash coat to the monolith by oxide to oxide coupling.
- the catalyst is formed.
- FIG. IB illustrates a microscopic view 145 of a channel of the monolith 140 that is coated with the layer of wash coat 150 having platinum atoms 155.
- FIG. 2A illustrates a second conventional method of manufacturing the catalyst.
- the second method is known as a two-dip process.
- a wash coat is made using micron-sized oxides that include pint size alumina and pint size silica, a certain amount of stabilizers for the alumina, and a certain amount of promoters.
- a cylindrical- shaped ceramic monolith is obtained.
- the monolith is coated with the wash coat such as via dipping. As such, the channels are also coated with a layer of wash coat.
- the layer of wash coat has an irregular surface which has a far greater surface area than a flat surface.
- FIG. 2B illustrates a microscopic view 250 of a channel of the monolith 245 coated with the layer of the wash coat 255.
- the monolith is dried.
- the wash coat when dried is a porous structure.
- the monolith is calcined. The calcination bonds the components of the wash coat to the monolith by oxide to oxide coupling. Micron-sized alumina oxides are then impregnated with micron- sized platinum ions and other promoters using a method that is well known in the art.
- FIG. 2C illustrates another microscopic view 250' of the channel of the monolith 245 ' coated with the layer of wash coat 255 ' having platinum atoms 260.
- FIG. 3A illustrates a microscopic view 305 of a surface of the layer of the wash coat after calcination.
- Platinum atoms 310 are attached to oxygen atoms of the alumina.
- the platinum atoms 310 help reduce the harmful compounds by converting them into less harmful compounds.
- these various methods of manufacturing the catalyst used in the catalytic converter suffer from a number of shortcomings.
- the platinum atoms 310 are not fixed to their bonded oxygen atoms of the alumina and are able to move around to other available oxygen atoms as illustrated in FIGS. 3B-3C.
- the platinum atoms 310 move, the platinum atoms 310 begin to coalesce with other platinum atoms resulting in larger particles 315, as shown in FIG. 3D, and a more energetically favorable state. It is understood that as the platinum particles become larger, it detrimentally affects the catalyst since surface area of the platinum atoms decreases. In high temperature applications, such as in an aged catalytic converting testing, the movement of platinum atoms is magnified. In addition, since cost of platinum is extremely expensive, excessive use of platinum is unwanted.
- the present invention addresses at least these limitations in the prior art.
- a catalytic converter includes a honeycomb structure with an at least one nano-particle on the honeycomb structure.
- the at least one nano- particle includes nano-active material and nano-support.
- the nano-active material is typically on the nano-support.
- the nano-active material is platinum, palladium, rhodium, or an alloy.
- the alloy is of platinum, palladium, and rhodium.
- the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- a cordierite substrate in a catalytic converter includes a first type of nano-particles, a second type of nano-particles, and a third type of nano-particles.
- the first type of nano-particles includes nano-active material and nano-support.
- the nano-active material is platinum and the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- the second type of nano- particles comprises nano-active material and nano-support.
- the nano-active material is palladium and the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano- support.
- the third type of nano-particles comprises nano-active material and nano-support.
- the nano-active material is rhodium and the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- a method of making a catalytic converter includes creating a dispersion using an at least one nano-particle and obtaining a wash coat.
- the at least one nano-particle includes nano-active material and nano-support.
- the nano-active material is platinum, palladium, rhodium, or an alloy.
- the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- the creating step comprises mixing a carrier material and different catalyst materials in a high temperature condensation technology, thereby producing the at least one nano-particle, and combining it with a liquid.
- the carrier material is alumina.
- the different catalyst materials include platinum, palladium, and rhodium.
- the high temperature condensation technology is plasma.
- the creating step comprises mixing a carrier material and a first catalyst material in a high temperature condensation technology, thereby producing a first type of nano-particles, mixing the carrier material and a second catalyst material in the high temperature condensation technology, thereby producing a second type of nano-particles, mixing the carrier material and a third catalyst material in the high temperature condensation technology, thereby producing a third type of nano-particles, collecting together the first type of nano-particles, the second type of nano-particles, and a third type of nano-particles, and combining with a liquid.
- the carrier material is alumina.
- the first catalyst material is platinum.
- the second catalyst material is palladium.
- the third catalyst material is rhodium.
- the method of making a catalytic converter further includes mixing the dispersion with the wash coat, applying the mix to a monolith, drying the monolith, and calcining the monolith.
- the method of making a catalytic converter further includes applying the wash coat to a monolith, drying the monolith, calcining the monolith, administering the dispersion to the monolith, drying the monolith, and calcining the monolith.
- a method of making a three-way catalytic converter includes creating a dispersion by using different types of nano-particles, obtaining a wash coat, mixing the dispersion with the wash coat, applying the mix to a monolith, drying the monolith, and calcining the monolith.
- the creating step includes using a high temperature condensation technology.
- the high temperature condensation technology is plasma.
- Each of the different types of nano-particles comprises nano-active material and nano- support.
- the nano-active material is platinum, palladium, rhodium, or an alloy.
- the nano- support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- a method of making a three-way catalytic converter includes creating a dispersion using different types of nano-particles, obtaining a wash coat, applying the wash coat to a monolith, drying the monolith, calcining the monolith, administering the dispersion to the monolith, drying the monolith, and calcining the monolith.
- the creating step includes using a high temperature condensation technology.
- the high temperature condensation technology is plasma.
- Each of the different types of nano- particles includes nano-active material and nano-support.
- the nano-active material is platinum, palladium, rhodium, or an alloy.
- the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- a method of making a two-way catalytic converter includes creating a dispersion by using same type of nano-particles, obtaining a wash coat, mixing the dispersion with the wash coat, applying the mix to a monolith, drying the monolith, and calcining the monolith.
- the creating step includes using a high temperature condensation technology.
- the high temperature condensation technology is plasma.
- Each of the same type of nano-particles includes nano-active material and nano-support.
- the nano-active material is platinum.
- the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- a method of making a two-way catalytic converter includes creating a dispersion using same type of nano-particles, obtaining a wash coat, applying the wash coat to a monolith, drying the monolith, calcining the monolith, administering the dispersion to the monolith, drying the monolith, and calcining the monolith.
- the creating step includes using a high temperature condensation technology.
- the high temperature condensation technology is plasma.
- Each of the same type of nano-particles includes nano-active material and nano-support.
- the nano-active material is platinum.
- the nano-support is alumina.
- the nano-support includes a partially reduced alumina surface, which limits movement of the nano-active material on a surface of the nano-support.
- FIGS. 1 A- IB illustrate a first conventional method of manufacturing a catalyst.
- FIGS. 2A-2C illustrate a second conventional method of manufacturing the catalyst.
- FIGS. 3A-3C illustrate activity on a surface of a layer of wash coat on the monolith using the first conventional method and the second conventional method.
- FIG. 4 illustrates a first inventive process of creating an advanced catalyst in accordance with the present invention.
- FIG. 5 illustrates a first inventive process of creating an advanced catalyst in accordance with the present invention.
- FIG. 6 A illustrates a first method of creating a dispersion in accordance with the present invention.
- FIG. 6B illustrates a nano-particle in accordance with the present invention.
- FIG. 7A illustrates a second method of creating a dispersion in accordance with the present invention.
- FIG. 7B illustrates a collection of different nano-particles in accordance with the present invention.
- Harmful compounds from internal combustion engines include carbon monoxide (CO), hydrocarbons (H a C b ), and oxides of nitrogen (NO x ).
- Two forms of internal combustion engines are diesel engines and gas engines.
- a catalytic converter is designed to reduce these harmful compounds by converting them into less harmful compounds.
- conventional catalysts used in catalytic converters use micro-particles such as micron-sized oxides and micron-sized catalyst materials (e.g. platinum).
- Embodiments of the present invention use nano-sized oxides and nano-sized catalyst materials to create advanced catalysts usable in catalytic converters of diesel engines and gas engines.
- nano-particle is generally understood by those of ordinary skill to encompass a particle having a diameter in the order of nanometers, as described herein.
- a diesel engine includes a diesel oxidation catalyst (DOC), a separate NOx reduction technology, and a diesel particulate filter (DPF).
- the DOC is a two-way catalytic converter, which converts (1) CO and 0 2 to C0 2 and (2) H a C b and 0 2 to C0 2 and H 2 0.
- the DOC uses platinum as an oxidizing agent.
- Conventional methods of creating the DOC use micron-size platinum ions.
- Embodiments of the present invention use nano-sized platinum particles instead.
- FIGS. 4-5 illustrate two inventive processes of creating an advanced DOC catalyst in accordance with the present invention.
- the separate NOx reduction technology reduces the NO x emissions by using urea as a reducing agent.
- the DPF catches subparticles (e.g.
- nongaseous hydrocarbons from an exhaust gas of the diesel engine.
- FIG. 4 illustrates a first inventive process 400 for creating the advanced DOC catalyst in accordance with the present invention.
- nano-active materials are pinned or affixed to nano-supports, forming nano-particles, by using a high temperature condensation technology such as a plasma gun.
- the nano-active materials are gaseous platinum atoms
- the nano-supports are some form of alumina, such as aluminum plus oxygen.
- platinum will be discussed herein, but it will be apparent to those of ordinary skill in the art that different platinum group metals can be used to take advantage of their different properties.
- a wash coat is obtained.
- the wash coat is commercially purchased or is made.
- the wash coat is a slurry.
- the wash coat is made by using micron-sized oxides that include alumina and silica.
- a certain amount of stabilizers for the alumina and a certain amount of promoters are also added to the wash coat. Typically, there is no difference between the commercially purchased wash coat and the created wash coat.
- the dispersion is mixed with the wash coat.
- a cylindrical-shaped ceramic monolith is obtained.
- the monolith contains a large proportion of cordierite since cordierite has a high resistance to thermal shock.
- the monolith is a honeycomb structure.
- a cross- section of the monolith preferably contains 300-600 channels per square inch. The channels are preferably linear square channels that run from the front to the back of the monolith.
- the monolith is coated with a layer of the wash coat.
- the monolith is dried.
- the monolith is calcined. The calcination bonds the components of the wash coat to the monolith by oxide to oxide coupling. In addition, the calcination allows the nano-active materials to strongly attach to the nano-supports because the nano-supports have a partially reduced alumina surface. As such, the advanced DOC catalyst is formed.
- FIG. 5 illustrates a second inventive process 500 for creating the advanced DOC catalyst in accordance with the present invention.
- nano-active materials are pinned or affixed to nano-supports, forming nano-materials, by using a high temperature condensation technology such as a plasma gun.
- the nano-active materials are gaseous platinum atoms and the nano-supports are some form of alumina, such as aluminum plus oxygen. Since nano-active materials are strongly attached to nano- supports, movement or coalescing/conglomeration of the nano-active materials is limited, prevented, or both.
- the nano-particles are then combined with a liquid to form a dispersion.
- a wash coat is obtained. The wash coat is commercially purchased or is made.
- the wash coat is made by using micron-sized oxides that include alumina and silica. In some embodiments, a certain amount of stabilizers for the alumina and a certain amount of promoters are also added to the wash coat. Typically, there is no difference between the commercially purchased wash coat and the created wash coat.
- a cylindrical- shaped ceramic monolith is obtained.
- the monolith is coated with a layer of the wash coat such as via dipping. As such, the channels of the monolith are also coated with a layer of the wash coat.
- the monolith is dried.
- the monolith is calcined.
- the dispersion is applied to the monolith via dipping.
- the monolith is dried.
- the monolith is calcined. The calcination bonds the components of the wash coat to the monolith by oxide to oxide coupling. As such, the advanced DOC catalyst is formed
- both pH level and viscosity of the wash coat must be in a certain range. Typically, the pH level must be between four and five to achieve oxide-oxide coupling. If the pH level is too low, then the viscosity is too high; as such, the wash coat is a paste instead of a slurry. If the pH level is too high, then the viscosity is too low; as such, even after calcination, the wash coat does not bond to the monolith.
- nanomaterials applied to the advanced DOC catalyst is described, the use of nanomaterials is able to be applied to the DPF and the NOx reduction technology used in the diesel engine. Other catalysts in the automation space are also contemplated.
- a gas engine cycles from oxygen rich to oxygen poor (e.g., an oxidizing state to a reducing state).
- a conventional catalytic converter for gas engines includes an oxidation catalyst and a reduction catalyst.
- the reduction catalyst is a first stage in the conventional catalytic converter.
- the reduction catalyst uses platinum and rhodium to help reduce NOx emissions. For example, rhodium catalyzes CO and N0 2 to N 2 and C0 2 .
- the oxidation catalyst is a second stage in the conventional catalytic converter. It reduces unburned hydrocarbons and carbon monoxide by oxiding them using platinum and palladium.
- platinum catalyzes CO and 0 2 to C0 2 and catalyzes H a C b and 0 2 to C0 2 and H 2 0.
- Palladium catalyzes H 2 and 0 2 to C 2 0.
- the oxidation catalyst aids reaction of the carbon monoxide and hydrocarbons with the remaining oxygen in the exhaust pipe.
- the gas engine uses a three-way catalytic converter to reduce the three harmful compounds.
- Methods of creating the advanced three-way catalyst for gas engines are similar to the methods of creating the DOC as discussed above. The difference is in the initial steps 405 and 505 of FIGS. 4-5, respectively. Specifically, instead of using just gaseous platinum atoms in the dispersion, gaseous palladium atoms and gaseous rhodium atoms are also used.
- FIG. 6A illustrates a first method of creating the dispersion in accordance with the present invention.
- Catalyst materials include platinum 615, palladium 620, and rhodium 625. Other catalyst materials are contemplated.
- Carrier material includes alumina 630. The catalyst materials 615, 620, 625 and carrier material 630 are mixed in a plasma gun. After vaporizing the catalyst materials and carrier material to form a vapor cloud and quenching the vapor cloud, the vapor cloud precipitates nano-particles.
- FIG. 6B illustrates a nano-particle 600 in accordance with the present invention.
- the nano-particle 600 comprises a nano-active material 610 and a nano-support 605. Since the plasma gun is extremely chaotic, the catalyst materials form into an alloy.
- the nano-active material 610 is an alloy. Since a ratio of the nano-active material 610 consisting of platinum, palladium, and rhodium, depends on an initial ratio of each of the catalyst materials used, different forms of alloys are formed on the nano-support 605. The nano-particles 600 are combined with the liquid to form the dispersion.
- FIG. 7A illustrates a second method of creating the dispersion in accordance with the present invention.
- each of the catalyst materials are separately mixed with alumina 630 in the plasma gun.
- three different nano-particles are formed.
- a collection of the different nano-particles are combined with the liquid to form the dispersion.
- the three different nano-particles are illustrated in FIG. 7B.
- a first nano-particle 600' is a platinum nano-active material 635 on the alumina nano-support 605.
- a second nano-particle 600" is a palladium nano-active material 640 on the alumina nano-support 605.
- a third nano-particle 600"' is a rhodium nano-active material 645 on the alumina nano-support 605.
- a size of the nano-active material is able to be controlled based on a quantity of the nano-active material that was initially placed in the plasma gun. Concentration of each different nano-particle 600', 600", 600"' is able to be individually and/or collectively controlled.
- the first inventive process 400 continues at a step 410 and the second inventive process 500 continues at a step 510, as illustrated in FIGS. 4-5, respectively.
- the invention has been described with reference to numerous specific details, one of ordinary skill in the art will recognize that the invention can be embodied in other specific forms without departing from the spirit of the invention. Thus, one of ordinary skill in the art will understand that the invention is not to be limited by the foregoing illustrative details, but rather is to be defined by the appended claims.
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AU2010332088A AU2010332088B2 (en) | 2009-12-15 | 2010-12-09 | Advanced catalysts for automotive applications |
EP10838155.9A EP2512664A4 (en) | 2009-12-15 | 2010-12-09 | Advanced catalysts for automotive applications |
RU2012129989/04A RU2583054C2 (en) | 2009-12-15 | 2010-12-09 | Advanced catalysts for use in cars |
CA 2784507 CA2784507A1 (en) | 2009-12-15 | 2010-12-09 | Advanced catalysts for automotive applications |
JP2012544650A JP2013513482A (en) | 2009-12-15 | 2010-12-09 | Advanced catalysts for automotive applications |
CN201080063588.5A CN102844113B (en) | 2009-12-15 | 2010-12-09 | For the advanced catalysis agent of mobile applications |
IL220388A IL220388A (en) | 2009-12-15 | 2012-06-13 | Catalytic converter and methods of producing the same |
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Also Published As
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EP2512664A4 (en) | 2014-05-28 |
US20110143933A1 (en) | 2011-06-16 |
MX343783B (en) | 2016-11-23 |
CN102844113A (en) | 2012-12-26 |
BR112012014723A8 (en) | 2016-10-04 |
MX2012006991A (en) | 2012-11-23 |
US20150141236A1 (en) | 2015-05-21 |
US9126191B2 (en) | 2015-09-08 |
JP6127097B2 (en) | 2017-05-10 |
AU2010332088A1 (en) | 2012-07-26 |
IL220388A (en) | 2016-08-31 |
RU2012129989A (en) | 2014-01-27 |
JP2015211974A (en) | 2015-11-26 |
CN105879861A (en) | 2016-08-24 |
AU2010332088B2 (en) | 2015-01-15 |
EP2512664A1 (en) | 2012-10-24 |
US9533289B2 (en) | 2017-01-03 |
US9308524B2 (en) | 2016-04-12 |
BR112012014723A2 (en) | 2016-04-05 |
US20160067679A1 (en) | 2016-03-10 |
CN102844113B (en) | 2016-03-02 |
RU2583054C2 (en) | 2016-05-10 |
CA2784507A1 (en) | 2011-06-23 |
JP2013513482A (en) | 2013-04-22 |
KR20120112564A (en) | 2012-10-11 |
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